| | Alien Front (Rev T) | 2001 | Sega | alienfnt | | 0.00 |
 | Alien Invasion (clone of: invaders) | 1969 | bootleg (Margamatics) | alieninv | Shooter / Gallery | 0.00 |
| Alien Invasion Part II (clone of: invaders) | 1969 | bootleg | alieninvp2 | | 0.00 |
| | Alien Poker (L-2) (clone of: alpok_l6) | 1980 | Williams | alpok_l2 | | 0.00 |
| | Alien Poker (L-6 French speech) (clone of: alpok_l6) | 1980 | Williams | alpok_f6 | | 0.00 |
| | Alien Poker (L-6) | 1980 | Williams | alpok_l6 | | 0.00 |
| | Alien Sector | 1985 | Namco | aliensec | | 8.50 |
| | Alien Star | 1984 | Gottlieb | alienstr | | 0.00 |
 | Alien Storm (bootleg, set 1) (clone of: astorm) | 1990 | bootleg | astormbl | Platform / Shooter Scrolling | 0.00 |
| Alien Storm (bootleg, set 2) (clone of: astorm) | 1990 | bootleg | astormb2 | | 0.00 |
| Alien Storm (Japan, 2 Players, FD1094 317-0146) (clone of: astorm) | 1990 | Sega | astormj | Platform / Shooter Scrolling | 0.00 |
| | Alien Storm (Mega-Tech) | 1990 | Sega | mt_astrm | Platform / Shooter Scrolling | 6.50 |
| Alien Storm (US, 3 Players, FD1094 317-0147) (clone of: astorm) | 1990 | Sega | astormu | Platform / Shooter Scrolling | 0.00 |
| Alien Storm (World, 2 Players, FD1094 317-0154) | 1990 | Sega | astorm | Platform / Shooter Scrolling | 6.89 |
| Alien Storm (World, 3 Players, FD1094 317-0148) (clone of: astorm) | 1990 | Sega | astorm3 | Platform / Shooter Scrolling | 0.00 |
| | Alien Syndrome (Mega-Tech, SMS based) | 1987 | Sega | mt_asyn | Maze / Shooter Large | 0.00 |
 | Alien Syndrome (set 1, Japan, old, System 16A, FD1089A 317-0033) (clone of: aliensyn) | 1987 | Sega | aliensynjo | | 0.00 |
| Alien Syndrome (set 2, System 16A, FD1089A 317-0033) (clone of: aliensyn) | 1987 | Sega | aliensyn2 | | 0.00 |
| Alien Syndrome (set 3, System 16B, FD1089A 317-0033) (clone of: aliensyn) | 1987 | Sega | aliensyn3 | | 0.00 |
| Alien Syndrome (set 4, System 16B, unprotected) | 1987 | Sega | aliensyn | Maze / Shooter Large | 8.81 |
